diff --git a/src/test.rs b/src/test.rs
index ebc32f8..3fc5065 100644
--- a/src/test.rs
+++ b/src/test.rs
@@ -26,7 +26,7 @@ where
 }
 
 #[cfg(test)]
-mod tests {
+mod argparsing {
     use super::{make_dummy_files};
     use crate::cli;
     use crate::cli::Command;
@@ -103,6 +103,77 @@ mod tests {
     }
 }
 
+#[cfg(test)]
+mod byte_pretty_printing {
+    use crate::bytes::Bytes;
+    #[test]
+    fn bytes () {
+        assert_eq!(
+            &format!("{}", Bytes::new(234)),
+            "234.00 B"
+        );
+
+        assert_eq!(
+            &format!("{}", Bytes::new(999)),
+            "999.00 B"
+        );
+    }
+
+    #[test]
+    fn kilobytes () {
+        assert_eq!(
+            &format!("{}", Bytes::new(2234)),
+            "2.23 kB"
+        );
+
+        assert_eq!(
+            &format!("{}", Bytes::new(62500)),
+            "62.50 kB"
+        );
+
+        assert_eq!(
+            &format!("{}", Bytes::new(329990)),
+            "329.99 kB"
+        );
+    }
+
+    #[test]
+    fn megabytes () {
+        assert_eq!(
+            &format!("{}", Bytes::new(2750000)),
+            "2.75 MB"
+        );
+
+        assert_eq!(
+            &format!("{}", Bytes::new(55000000)),
+            "55.00 MB"
+        );
+
+        assert_eq!(
+            &format!("{}", Bytes::new(987654321)),
+            "987.65 MB"
+        );
+    }
+
+    #[test]
+    fn gigabytes () {
+        assert_eq!(
+            &format!("{}", Bytes::new(5280000000)),
+            "5.28 GB"
+        );
+
+        assert_eq!(
+            &format!("{}", Bytes::new(95200000000)),
+            "95.20 GB"
+        );
+
+        assert_eq!(
+            &format!("{}", Bytes::new(302000000000)),
+            "302.00 GB"
+        );
+    }
+}
+
 // #[cfg(test)]
 // mod cli {
 //     use super::*;